Stoker



Mai'ch 17, '1942. c. R. DAVISON ,27

STOKER Filed March 16, 1939 2 Sheets-Sheet l INVENTOR (meme-s A? 0/: W6 04/ AT 'QNEYS March 17, 1942. c. R. DAVISON STOKER 2 Sheets-Sheet 2 Filed March 16, 1959 Tic.

INVENTOR 4o 5) 42 W i poses of illustration only.

Patented Mar. 17, 1942 orri cs STOKER Charles It. Daviscn,.Erie, Pa, assigncr to The Standard Stoker Company, Incorporated, a

. corporation of Delaware Application li-Earch 16, 1939, Serial No. 262,213 6 Claims. (Q1. 110-1055) This invention relates to stokers of the type employing a pressure fluid blast for projecting fuel in an upward and forward direction against the underside of a superimposed plate member for subsequent distribution over the firebed.

It is an object of this invention to provide, in a stoker of the type specified, a new and improved pressure fluid head which is arranged to issue a substantially flat and transversely unbroken blast of pressure fluid against the underside of the superimposed plate member to the end that sub stantially all of the fuel may be acted upon by the blast for uniform distribution over the firebed.

Another object of this invention is to provide the jet head with a plurality of separated chambers, each arranged to receive fluid under pressure which is emitted therefrom in one or more thin sheets for supporting and projecting against the underside of the superimposed plate member substantially all of the fuel delivered to the jet head.

A still further object of this invention is to extend the central portion of the jet head in ad- Vance of its side portion in order to compensate for the preponderant quantity of fuel delivered centrally of the jet head by the helicoid screw employed in conveying fuel forwardly.

These and other objects, such as the construction of the parts and their relation one with another will become apparent as the following description is read in connection with the accompanying drawings, wherein Figure 1 is a central vertical section taken longitudinally through the rear poi ion of a locomotive boiler with the stoker according to this invention shown partly in similar section and partly in side elevation;

Figure 2 is a view from within the locomotive firebox taken along the line 2-2 of Figure 1;

Figure 3 is a plan sectional view taken on the line 3--3 of Figure 1;

Figure 4 is a sectional view of the improved jet head taken along the line t-A of Figure 3;

Figure 5 is a plan section of a modified form of the improved jet head;

Figure 6 is a front elevation of the structure shown in Figure 5; and

Figure '7 is a longitudinal section of the jet head taken along the line 7-4 of Figure 5.

Referring first to Figures 1 to l, inclusive, L indicates a locomotive to which the stoker S of the present invention has been installed for pur- The locomotive L comprises a boiler it having a backwall H rear- (not shown) ward of thefirebox l2. Above the level of grates t3, the backwall H is provided with a firing open ing 24 through which fuel is introduced into the firebox t2 by the stoker S. ,A cab deck 9 extends rearwardly from the backwall I I and is disposed at a level below the firing opening M but above the level of grates l3.

The stoker S includes a fuel discharge section it, the lower portion [6 of which is secured to a tubular section ll while its upper portion it embraces the firing opening I4 and is'provided walls'24, 25 ofthe dischargesection l5, overlap the backwall II and are secured thereto by bolts 2'5. Approximately midway between its upper and lower ends; the tubular section I I is provided With a foot member 27 which is secured in known fashion to a bracket 28 rigidly carried by the backwall H.

A spherical seat 29 is formed with the lower end of the tubular section if for receiving a spherical shell 3B formed on the forward end of a conduit 3! leading forwardlyfrom the tender Within the conduit 3! is a con veyor screw 32 universally connected at 33 to another screw 34 which is disposed within the tubular section H and extends into the discharge section I 5. This arrangement of conveyor screws has been found to result in efiicient delivery of fuel, by gradual stages, to a distributing mechanism D, the novel construction and operation of which is now to be described. r

' The bottom of the lower portion Etof the conduit discharge section I5 is formed by the top wall 48 of the jet member 46, the latter being provided beneath said top wall '49 with a plurality of transversely separated chambers G2. Each chamber 42 is arranged to receive fluid under pressurethrough a suitable nipple 43 for emission through apertures formed in the front wall '46. The front wall 4 3 extends into the lower portion of the firing opening Hi and forms a right angle with the top wall 4i so as to present a a forwardly and upwardly directed face 45 comprising a central portion 46, side portions 41, 43 disposed rearward of the central portion 46, and sloping intermediate portions td, 59 which join the central portion 46 and the side portions 41, 43 respectively. 7

The central side and intermediate portions'of the upwardly directed face 45 are each provided with a pair of vertically spaced laterally distended slots 55, directed substantially parallel with the top wall 40 of the jet member 41 and are each arranged to emit a thin sheet-like blast of pressure fluid against the underside 56 of a superimposed fuel diverting member 53. The fuel diverting member 53 is supported upon a horizontally disposed shaft 51 which is secured in suitable bearings, formed in the upper portion I8 of the stoker discharge section l5. Means is provided for adjustment of the fuel diverting member 53 and this means includes a lever 58 secured to one end of the shaft 51 and a latch plate 59 which is formed with the upper portion I8 of the discharge conduit section. Latch plate 59 is provided with a plurality of holes 60 for receiving a pin 6| which passes through the lever arm 58 for locking the fuel diverting member 53 in any desired position of adjustment.

On its underside the fuel diverting member 55 is provided with a pair of outwardly diverging ribs 55, and serves to intercept fuel projected upwardly by the jet member 4|, causing such intercepted fuel to be distributed to the back corners of the firebox l2.

In the actual operation of this device, it has been found that by the use of the flat sheet-like blast of pressure fluid an adequate support for the fuel is provided with the result that substantially all of the fuel is forcibly impinged against the underside of the fuel diverting member 53. Th fuel which strikes the underside of this member 53 ricochets forwardly and downwardly for subsequent distribution over all parts of the flrebed. .It has also been found that by the use of the slots 55 through which the flat sheet-like blasts of pressure fluid are emitted, very little of the fuel conveyed to the jet member 4| by the screw 34 falls downwardly without being acted upon by the pressure fluid jets. For purposes of illustrative clarity the slots 55 have been slightly exaggerated in'Figures 1, 2 and 3. Actually, the slots are constructed to provide a very thin blast of pressure fluid and this construction has been found to utilize considerably smaller volume of pressure fluid than do structures used heretofore. It is important that a plurality of chambers 42 be provided in order that the pressure in each may independently be varied and also because the walls 43 which separate the chambers from each other serve to form a rigid jet structure. It will be understood, that with a plurality of slots 55 in the front face 45, this structure is desirable.

In Figures 5, 6 and '7 there is illustrated a modified form of a jet member 4|, having a front fract 45a thereof so formed that its central portion 45a is convexly curved and extends beyond the side portions 41a, 48a. In all other respects, this jet member is the same as the one shown in the preferred form of the invention, and will function in the same manner. In Fig. 5 the slots 55 are clearly shown as increasing in width from back to front, so that the blasts of fluid under pressure issuing therefrom intersect close to the face 45a of the jet member 4|, thereby limiting the amount of fuel dropping between the blasts to a negligible quantity. I

From the foregoing, it will be apparent to those familiar with the locomotive stoker art that a stoker has been provided which will efficiently carry out the stated objects of this inven tion. Other modifications of this invention are contemplated, as set forth in the appended claims.

Iclaim:

1. In a stoker having a conduit for feeding fuel into a furnace through an opening in an upright wall thereof, a pressure fluid jet head at the lower forward end of said conduit provided at its foremost end with a jet face, means providing a plurality of transversely separated chambers Within said pressure fluid head rearward of said face, each of said chambers arranged to receive fluid under pressure, said face being provided with a plurality of upwardly and forwardly inclined laterally distended slots arranged to issue thin, sheet-like blasts of pressure fluid toward said furnace, and means for urging substantially all the fuel through said conduit over said jet head and into the zone of action of such pressure fluid blasts.

2. In a stoker having a conduit for feeding fuel into a furnace through an opening in an upright wall thereof, a pressure fluid jet head at the lower forward end of said conduit provided at its foremost end with a jet face, means providing a plurality of transversely separated chambers within said pressure fluid head rearward of said face, each of said chambers arranged to receive fluid under pressure, said face .being provided with a plurality of upwardly and forwardly inclined laterally distended slots arranged for the emission of thin, sheet-like blasts of pressure fluid toward said furnace, and a conveyor screw in said conduit for urging substantially all the fuel through said conduit over said jet head and into the zone of action of such pressure fluid blasts, the central portion of said face extending forwardly beyond the side portions thereof.

3. In a stoker having a conduit for feeding fuel into a furnace through an opening in an upright wall thereof, a pressure fluid jet head at the lower forward end of said conduit provided at its foremost end with a jet face, a deflector plate above said pressure fluid head, means providing a plurality of transversely separated chambers within said pressure fluid head rearward of said face, each of said chambers arranged to receive fluid under pressure, said face being provided with a plurality of upwardly and forwardly inclined laterally distended slots arranged for the emission of thin sheet-like blasts of pressur fluid against the under side of said deflector plate, and means for urging substantially all the fuel through said conduit over said jet head and into the zone of action of such pressure fluid blasts.

4. In a stoker having a conduit for feeding fuel into a furnace through an opening in an upright wall thereof, a pressure fluid jet head at the lower forward end of said conduit provided at its foremost end with a jet face, a deflector plate above said pressure fluid head, means providing a plurality of transversely separated chambers within said pressure fluid head rearward of said face, each of said chambers arranged to receive fluid under pressure, said face being provided with a plurality of upwardly and forwardly inclined laterally distended slots arranged to issue thin, sheet-like blasts of pressure fluid against the under side of said deflector plate, and a conveyor screw in said conduit for urging substantially all the fuel through said conduit over said jet head and into the zone of action of such pressure fluid blasts, the central portion of said face extending forwardly beyond the side portions thereof.

5. In a stoker having a conduit for feeding fuel into a furnace through an opening in an upright wall thereof, a pressure fluid jet head at the lower forward end of said conduit provided at its foremost end with a jet face, means providing a plurality of transversely separated chambers within said pressure fluid head rearward of said face, each of said chambers arranged to receive fluid under pressure, said face being provided with a plurality of upwardly and forwardly inclined laterally distended slots increasing in width from back to front arranged to issue thin, sheet-like blasts of pressure fluid toward said furnace, and means for urging substantially all the fuel through said conduit over said jet head and into the zone of action of such pressure fluid blasts.

6. In a stoker having a conduit for feeding fuel into a furnace through an opening in an upright wall thereof, a pressure fluid jet head at the lower forward end of said conduit provided at its foremost end with a jet face, a deflector plate above said pressure fluid head, means providing a plurality of transversely separated chambers within said pressure fluid head rearward of said face, each of said chambers arranged to receive fluid under pressure, said face being provided with a plurality of upwardly and forwardly inclined laterally distended slots increasing in width from back to front arranged to issue thin, sheet-like blasts of pressure fluid against the under side of said deflector plate, and means for urging substantially all the fuel through said conduit over said jet head and into the zone of action of such pressure fluid blasts.

CHARLES R. DAVISON. 

